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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97bcc95c2846d550d51a3b5401ec53203cc785f3a096944a63fe64551f401c7' 
  AND token = 'F60GDhYc3BQXF6TQUmBwXRkvbJMa8rZ+b14D9k5ILL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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