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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb6244a4394cfdc9cfe8ad7fbc4935a8afbc978fcf8102a1c12d8631083b4ec' 
  AND token = 'bw2AT6EahJl5V3B+yS45MbQOIQLzuOA8FfzOdd5n3E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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