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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c4cf68aebce523082d4a4c81082f1e23250a0a51ffdb4bb16f3b295197aa3f' 
  AND token = 'b7uhhSSoX5rU4OB+OCjgLk7TrAcnUGVx2/2EbZoXrbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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