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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccb0f53697334c69e371e08f10b45139ab476439d38d4b99f3f933468fb6cb0' 
  AND token = '8/rGAPHGjEFzA8CX3kFiFGF9d5tEvYhjIYzT0q2/r68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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