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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b9bae648014ec4113fbd41f00b7493d737498369415de1dbf5e6e0ee319a4c' 
  AND token = '5LWNyvagAGzm99Ud8poBtPkhnHGtL4lEcBo91XIX+es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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