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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b1243a3930c0d3bafe61d178a2f80c20ace4423a063178814678f69ac82281' 
  AND token = 'Am5aBo5inYXZ6UUMHhcIadap036QHH2vmMsd8SXJzh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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