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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7480cd2e9b856e05d5500f94cc052a09b87a0fb9292a19ad40c64a81a2bc8b' 
  AND token = 'goEGxa9JsLqZFCLkdsoyQ6550URr2S6I+4CWFp9MR8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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