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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eac3bea426b20df866ba29d5a365a0cb723c2a3585138384ba49a3e95a07754' 
  AND token = 'rGcF0yHFg9fTbkk7BmX5Frdazl6/Qyi3oOfnvnK/xKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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