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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bab66f070c501f6149a1688a6c4e4a151de4f96a500b6157783bd2e234ce016' 
  AND token = 'HsOOwTf2QDJA1B0eW4WRQQ50F4w1AjCUbv6uGT2btYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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