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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81d1af5de4b6b5b7c727b4f39813fc428954094371ef2939efa4ab6e1f09bc8' 
  AND token = 'g07CVaShLINJ0nBMyiCH1A1CaY8ey4iCKhjFnU0THkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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