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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feeab9d7fe8b13a7a437067ae8c0e1b3f64ee5dc1f65dd857df36dd332584b2f' 
  AND token = 'iMbikMjTgR4Qq9mbtb5dyDlV2WEqRZP7m3Sya/dx3dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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