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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b9c7b818d3e10da5b7c3da6ac292c447021cafd735de15b82acb9fed6a1dc1b' 
  AND token = '7QQKXNQCXhzrDsH1U08KvqM22qwth7epNm5XMPuA4V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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