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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a3c1d1260dfaed420c618aa50859e208c1ad480e2495b167e1a86069afcb3c' 
  AND token = 'jCAhjzNNceLLSWzCKYY2y8XWLs8RbZhu13TI594gsXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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