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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdfb89f9feaf84fabe827299dfdddc0e0d42e7fa296c0889596f856fb8f7a99b' 
  AND token = 'kyGHSxA0ZqzKznrUnPh3exzF8c6VWoNeteugk9N+YUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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