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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7090dcc0271feddd0417fe6c17a94b04f11d773cca99b599b18ba83886df37ef' 
  AND token = 'qstvrhkmZcP2e0VxJOZc/ZFBU1xfUlu6Tyk6e0UORLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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