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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68866b809bb1939ca21a3698542b6166e46b857a37342dbdfdf39d2926d559dd' 
  AND token = '+svU1AXnUAjcN3TAJVA/yMVUF70hLtm9l9D0kUdpOkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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