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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76335f137b3fab75b898fe61c78bb19a8a9a05628924e1ef92dd2e34d7c0f26b' 
  AND token = 'NiD9GzpQ63z3WImDXHDSaaV/8qGS/3qkyR9fnTkUGzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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