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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c138833227d652d6652e688b9e1b1ac6da8b6f2b305384a424428413191fc658' 
  AND token = '/ZGGq4dAFxpTT/Ey3f/J7ZTskevkkMOMtqRv2LBoWv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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