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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0adaaa675133b67ca2ae2c722f685a3c9b8f22b0c4b98d4c2a7d29b1ad512a4' 
  AND token = 'Zjkj2UXDmYwsHQHCA+P7Jylrft11U+roJThEw6osA3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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