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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f06abe992b032c9effd7a27ae99c9e1e04d0ec2fbd0375027ce35b409ae663f' 
  AND token = 'NAy1yjcstYiwfF6efWnQ5mw/jtTw1mYV9+C+iBRRCCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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