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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe6ececd7031886b210b5f3e5ad0f243cb9f7ec23caf8e2655ec5be9086a5cc' 
  AND token = 'v4hfi1wy5q16maovXF7xJcmUdGuilMDpoJ7qKo7/+sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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