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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c6dfa16b826cb30472375c88b2a62f50ea90565ecfff2b2652bd3579d16d48' 
  AND token = 'pDzKpswv6J45pZk298I1MA8zUNMoypENs3l6W1qo+W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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