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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9ea9b8f75ef259dc4f804e78e54afe6ad5f317fc8e67d71c2449322ffa48e5' 
  AND token = 'vDj/HTW/D12fyIXXMINucvLc8dW6GwwFEl3q4JnqbWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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