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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69fbe792b62fe6efb386a55542d1df475add9f561ad419dea771da252f3c05a9' 
  AND token = 'cVkv7wrSzvPRrQnXzvP/2l8Agb6Vk/xWu99JJmJDzTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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