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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa60632d506db76f995049a85e2991c8a1b3df081e81c9d29429afd57c5b8a66' 
  AND token = 'HyEhegWQwfS9Y0cXUmpaT/A3RPSD0vvgs5xLxQaQ4FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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