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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69a90d6891f287babf7dfe702e1bed4a9a8ece68a56a5dfecc0b53ef3186f54' 
  AND token = 'zk8PTZmXf4z8s3982OoBWfdEyZwJRQ+zEizhiYvhKYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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