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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f895bece4b81e6f2eb2877647773658956a9a42e3d0fd397e510ed926154180f' 
  AND token = '2lzWx6aOeB14MXpEpMI7YHaDLunVHgdOO5+wqmk8naU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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