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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eff1334282b30777a8caf357baa6fdbe74c91f441fa16ee0ba75d89290c2293' 
  AND token = 'JricqFJjXvMKdXYHnOnn5pcTKbEcC2AFHuCRY6x5tYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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