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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f6177799784a9f409a06ad54543dc8d6b7603d834695c4cac38bc73578c4ea' 
  AND token = 'm65cROM2ax/6SOeI8zHl3iAN3fqc27/1FAPkggq1O4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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