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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97677064ca5556b556ef8727a59b33b27587e5699291de9d7220f89b68610be2' 
  AND token = 'VC2VzIT4mFgs7bChoRmCj9RgplKxbAMgFY3QdkCbLPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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