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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848503c86c76afae480556991351c66d059a9a03235f4c9d325099499896199f' 
  AND token = 'B7advjSjQytgSh/inAJ3OI7wlA3+gY52w3Ohlwstg4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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