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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f90c08058fa44e9bb01a50d8689a472de56e7b3dd2e1c96ad71f268c3775c57' 
  AND token = 'cL4p2RkP+grGYqe18zptipGO3h+qp0lEzkNMohBKlQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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