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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33fbc6cdcb90c8edf663d00a88e748a71319de66582b5a2ae1cc6e35c5a8e346' 
  AND token = '9WKWQzHND7Iy9rNk/P6dPT51/2BJbWyFcXAYuzVhjO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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