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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05e1833f33894237016e28a75b0416575ba70dca7859c4385b8e127061b1934' 
  AND token = '9CGvcR3rfC/jUu6pL3KuR1rfSWds4JwNu3N0Y701m4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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