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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02ba9a0f75299cd31b2ab16a56c33d6c29385d894ad80a1931b1875298874cf' 
  AND token = 'ON7rWBnew7R4SR4cmLb4xznD6tKdaXqxSlkX5Gzk6bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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