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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a79234a1da5168b391d573970119163a5607e180361dcd6f17dce832f6e2eec' 
  AND token = 'zQF9JY9vMj3lf+0B8xT/FgQtH5M1i5B7OzhaBtwx/5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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