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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037c207925e419264cf9f664c8b1dffabf25b2d794e0be30a7a7a3773c58ce0d' 
  AND token = 'jyfOqWqU7w0BdwRpIFPS/2hSA9OXBNknC+ZxbfLORd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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