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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3110d36b5c4e74dad5d6ae4e57204a4bb1174de8dfc2c767ed5230c3d001031' 
  AND token = 'JuBanuBdkQawfNhjccm7s55RV/suZB7L285xlQfZq9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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