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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a9e86f54e3c840d4f32d644e83b205e35722a624f4e04b68e37463f64555d3' 
  AND token = 'HyUC2rDCbIUz1ZeA76kTEmyhMlD8jP6v8GvqQZ78txU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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