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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea07f87182ff005e9084309004c860eb51e277cd22b8383878c6866ca7a07658' 
  AND token = '1PRq28Wf/0t+xhKjIYoxtWPBgeUL7aX8LPFY38tYKio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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