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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e3814a5c843b834dfdd474708a432ef9e9b445cc40fe2cee41065c71910dd3' 
  AND token = 'NNdL3AEt/koWmc0FQchlpFBniQ1LdHOAQXgp0QyCtFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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