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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58629789ed31e28df862a8e767a261cb42011a08d60ad097bb706893ee6a9f9b' 
  AND token = 'IAk+iuXtTbzKOKM5GH/2n8VkpBYfqu9c3OwEaRTstnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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