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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6823a40bf60dcd5b66616494c3e2198095b00bdf1881f14df4831e789b4ba39c' 
  AND token = 'zQkOLjZHZIPsZdIIXKlwx4hdEI3kOvV+HbLvtMKEB04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}