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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b837fb3ce0970c8fef55b6b8ea6c0563eadfc5a3ea7b3c0ee09751125dada8e6' 
  AND token = 'PwbvjzIwgIlJZse/w2DTk1389sah63wa8IMtJVXTD+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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