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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a3b56cc0054d605e493b60706d6507b028cc8a37970214a1772e244a7e7a00f' 
  AND token = 'W4jBfH/K//wwqu8duKyxejvXjq3r5s6eepQAGamAAMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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