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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c070f779b356c0652f213284e2c59db9663b0115ead7c779cd9187dd8fcbe7d2' 
  AND token = 'iC8MVJ+dMe5hsr6HiY9iComMKlesHML3xHbA6UdfHEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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