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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5e55753fafc40ec0707c68e0f66f602271f997d615e399a5975481eaf60c86' 
  AND token = '1WyXI6k7PhssyHFxt0FUFEth1laMppY5o8l7Oz9siGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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