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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c9af562f60f4e16b42cbad6e6d4b1dfcaf114578a79ab6669d09ab2b30beaf' 
  AND token = 'pjmU9+OKf5ShDrhhmRfMKgn463ntDivbKaxa8pzeJok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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