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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a51729eefb36a9e0206f761ade1a01b87c47821e3602a440fe2ae897c28f3f' 
  AND token = 'VOLEaroyOf7eBzQXrweqtoy42fNzVUaOG9fCkiSiMuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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