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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5cd452e1500c0b8b2191bd4658774baa8104d5c1caa51c8c844148c4fa6647e' 
  AND token = 'DmLX5F6jqJ83EBmv30RAtum/ijP+G8E4hhc7cmAM9ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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