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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a1dc9838e36d242eaac0b7ab7aaa2a1da3431ce671837b1613c24cdf527d79' 
  AND token = 'VN4lH2r/+Oi7fQsD8S9uel4AAUUtCEohGFa6jL/9a9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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