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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6a3b38425a80d30542fd4a1834f37cbeb6310ba59291a78f40215e2734e678' 
  AND token = 'JJ6MXcYXBV12yyG79eYdcM0MOlT7HdDUfEHRQUlDgGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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