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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5219e49df105ceee14294adc16361de29af19e74207fff407614f787e86c6a70' 
  AND token = 'zRzgZFgpE5v+ti64o/TOPsDFB5RuFvUxFmo/OsEZkkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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