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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd385e300d55de42858173b383146e1bafb63757dadb5803356155d9495f722' 
  AND token = '1MQkbFm4kPkEMdZvfssyzVSD/zuTpb5YTHFzurANM6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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