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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf73ad4b0ded5fab2dff4d6ca41f8bd35a8594ca063cb9a715dd7bdcb0ec823' 
  AND token = 'fbhrIsiSDXmm8jYuO4EV45FfAVODqV9cSRlM9BITJ/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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