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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7acb7bd407723222734f09a2c29876fac40a705681d48954d17f7a5378664017' 
  AND token = 'MY9W4kUEMLiEMH9d0t0/E9k/TrO40kr3IcaDKDNN+NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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