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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0392ae3a6ed224944a95481cc931931d69827ea181ff6825b043e7735d539291' 
  AND token = 'oAAZI5ZjSVYbgr0ITfPzxwMT6V9/Hn3y/DiwdVVrE2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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