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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfd1e077f434324cd52d3818304abd00a8498b886214f5e89bf28fac157c398' 
  AND token = 'wAMJnKqSj+7nDySWO+6mFuzaoM6Eoj4TjeZXqudS7LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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