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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6acea934d0c2894f4d95507a63db056590967c810e9063c84e3b2ec08d4bdb9' 
  AND token = 'xd2faXoJJwqQ/DcO9dKBGH4HvDWRG2SZV5dgRta6EaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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