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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35c89bf5518de9076ec0dffe3ab9d7860021ccb8072271ecbb3c3c2ca83c37a7' 
  AND token = 'NlSIjAEeyQ+aAPSG8q7AFRco8uqdLN+Ked3b7waTZGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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