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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c962a46636f2f1438b29e52290bc38971be1cac60a532efab1ca6054eddba5' 
  AND token = 'RhRY4wAs7ARzFFKTWKDHOQ+8JvD7Pt27TCuB6BeCeJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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