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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da0a73cb20da5e7e4715798eacc37a3fcc8202301f4075e79bd7e08e31e3b30' 
  AND token = 'AUrOzd92DogZSqoedHGqwewsdoayXK56ZBd3/4BdLe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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